The unsteady leakage flow and heat transfer characteristics of the turbine blade squealer tip was numerically investigated using three-dimensional Unsteady Reynolds-Averaged Naiver-Stokes (URANS) standard k-ω turbulence model. numerical simulated coefficients were well agreement with experimental data. accuracy method validated. steady coefficient without film cooling conducted. design at three...

CFD was employed to simulate the steam flow in 1.5-stage cascades with three different seal clearances. When clearance is 0, there no leakage, obvious secondary cascade, and stage efficiency reaches 88.27%. of diaphragm rotor tip 1mm, leakage strongly interferes which promotes formation development end-wall near hub, has little effect on next stage, drops by about 2 percentage points. 4mm, hub ...

A computer program for thermodynamic performance of a scroll compressor was developed. The thermodynamic model assumes that the compression volumes of the scroll compressor are separated and interact only through leakages between them. The continuity and energy equations are used to calculate the pressure and temperature of the compression volumes. A leakage flow model is used to simulate the m...

The results of a series of numerical simulations for the NASA low-speed centrifugal compressor are presented. Large-eddy simulation (LES) is carried out together with the most commonly used Reynoldsaveraged Navier–Stokes (RANS) models, including the mixing length, k– and k– models. Predictions are compared with the available experimental data. It is seen that quantitative predictions of LES are...

Tip clearance inevitably exists in helico-axial flow multiphase pumps, which generates a great impact on characteristics. To select reasonable tip and improve the transporting efficiency, different clearances (Rtc = 0.5, 1.0, 1.5 mm) are chosen to investigate behaviors hydraulic Based shear stress transport k-ω turbulence model, unsteady Reynolds averaged Navier–Stokes equations applied solve f...